package com.vf.admin.common.jiami;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * md5加密
 * @author anxiang
 */
public class MD5Utils {
    public static MD5Utils getInstance() {
        return new MD5Utils();
    }
    /**
     * 使用md5的算法进行加密
     */
    public String md5(String plainText) {
        byte[] secretBytes = null;
        try {
            secretBytes = MessageDigest.getInstance("md5").digest(
                    plainText.getBytes());
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException("没有md5这个算法！");
        }
        String md5code = new BigInteger(1, secretBytes).toString(16);// 16进制数字
        // 如果生成数字未满32位，需要前面补0
        for (int i = 0; i < 32 - md5code.length(); i++) {
            md5code = "0" + md5code;
        }
        return md5code;
    }
    /**
     * 使用md5的算法进行加密
     */
    public static String md5Generate(String plainText) {
        byte[] secretBytes = null;
        try {
            secretBytes = MessageDigest.getInstance("md5").digest(
                    plainText.getBytes());

        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException("没有md5这个算法！");
        }
        // 16进制数字
        String md5code = new BigInteger(1, secretBytes).toString(16);
        // 如果生成数字未满32位，需要前面补0
        for (int i = 0; i < 32 - md5code.length(); i++) {
            md5code = "0" + md5code;
        }
        return md5code;
    }

    public static void main(String[] args) {
        String a="custOrderNo =615051705&orgNo=8161000204&payAmt=100&payType=04&subPayT\n" +
                "ype=02&version=2.1";
        String s = md5Generate(a);
        System.out.println(s);
    }
}
